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Question
Three coins are tossed. Find the probability of getting exactly 2 heads.
Sum
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Solution
Given: Three fair coins are tossed once. Assume each of the 23 = 8 outcomes is equally likely; the sample space is {HHH, HHT, HTH, THH, HTT, THT, TTH, TTT}.
Exactly 2 heads:
Favorable outcomes: HHT, HTH, THH (3 outcomes).
Probability = `"Favourable"/"Total"`
= `3/8`
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Chapter 22: Probability - Exercise 22A [Page 505]
